You haven't said what nation your passport is from and where exactly the password was issued. And are those three names in the >>>>MRZ>> zone, how are they separated? This would be your first clue on how to supply the name. Without more information it's pretty hard to give you some advice, other than wait to hear back from the embassy you're applying through.
all DTV applicants must be outside of Thailand to apply. You will need to be outside of Thailand to apply and then you're dependent will need to be outside of Thailand to apply once you get yours.
You haven't stated your nationality. some embassies initiate extra scrutiny from some nationals of foreign nations. These extra requirements are usually noted on the embassy website.